1. Compute SHA-256 of OTSCanonicalRecord value → must equal OTSHash 2. Open OTSProofURL → extract Bitcoin block number → must equal OTSBitcoinBlock 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Read CopyrightID inside OTSCanonicalRecord → must equal the CopyrightID above 5. GET OTSVerificationAPI → pre-computed 6-check result from server 6. If all match: this entity was registered on CopyrightChains at OTSTimestamp, independently verifiable on Bitcoin Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d35be1c04d36965b1170cb8843202911ba32fe2b178ac95f703cc49cfb6c1e2. Chain 2 (Bitcoin): anchored in block 953645 (2026-06-14T14:31:42Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/3f933e9c-5220-46a3-a0c3-0ff40e0816f0.json and https://artists.proofprofile.net/proofs/artist/3f933e9c-5220-46a3-a0c3-0ff40e0816f0.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a25682e5696f648a43fc5230dd5285fd8cc710dffce9c4ef8662d8eae880755. Chain 2 (Bitcoin): anchored in block 960497 (2026-08-01T02:22:04Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TCAHB2344482.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x551f583f47252a76fb9c128bea8e5f8bcb9087e32fb2f6be8d994cbf23db3c42. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TCAHB2344490.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5576ee865c5afe7d1d96dc8482a13bfa7be58b4be4940f3c6e09608108d7124a. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TCAHB2344503.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7aa05ac16093a76074fa433fae9f424d483edb78323435c6f08cdb6925f25f6. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TCAHB2344511.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5e51a81d59c7180304bb7e81e57c4c2715750d47a071668ec34fea4645f8ec0. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TCAHB2344513.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4363e7d89ab9791167ded14fcbe2666fe36a3cf854bef2b46d3dff7bf51912bc. Chain 2 (Bitcoin): anchored in block 960155 (2026-07-29T22:13:32Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TCAHB2344518.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71507ca8be2d0fb7073033745b729ccc90fd04514257af1eab2b2e596e51cf33. Chain 2 (Bitcoin): anchored in block 958362 (2026-07-17T04:32:48Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TCAJL2503508.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf91775c24a0000537343b963440b5be7e1dc4386623af2fb0a655e4b2de07d3c. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TCAJL2503516.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63c494525363d94f7c07ddc0ddb5470bd8e4e2951a6a21b20f44f947f21daa87. Chain 2 (Bitcoin): anchored in block 958366 (2026-07-17T04:59:09Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TCAJM2503518.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x835765e5b53a1648ce1632891afb1864d93c0fe4dae0d1d1506a5e1b949c9b42. Chain 2 (Bitcoin): anchored in block 958397 (2026-07-17T10:29:45Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TCAJL2503523.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c1816b9a95d86cc2c3c4e2c79b61e4e6bc5b7bcdd0f14c00ec4699f5c00d31b. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TCAJL2503572.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6b5064f126fe297eb47b796fd38617988f327ae1d06c9be56ad4604dc04696d. Chain 2 (Bitcoin): anchored in block 958276 (2026-07-16T10:20:17Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TCAJL2503604.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7052a4be0364e9cc44e622dcdf1039b8c6fa40cc1bb6271f1b3e0df9346afbdb. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TCAJN2540679.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb5e2f14da02397121147828990230d119bd81d85c821cf568ec8460a7f37644. Chain 2 (Bitcoin): anchored in block 957779 (2026-07-13T00:19:08Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TCAJN2540683.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9496375e14a2e26aa66443b6e8e72daa46df497988e0d222cc7c7d4960253769. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/TCAJQ2535375.